Load-participated hybrid DC power transmission system sending end AC fault ride-through control method

• Main Authors: ZHU XUDONG, REN JUN, SHAO JUNREN, TANG TIEJUN, ZHANG MENG, LYU YONGBING, MEI QILONG, XU GENTANG, CHEN QIAN, YANG TAO, LIU YUE, HAN JIANWEI, LYU TAO, BI WEI
• Format: Patent
• Language: Chinese; English
• Published: 12.08.2022
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

The invention relates to a load-participated hybrid DC power transmission system sending end AC fault ride-through control method, and belongs to the technical field of power supply from a hybrid DC power transmission system to a passive network. Firstly, the working characteristics of the full-bridge sub-module are utilized to realize flexible adjustment of MMC direct current voltage, direct current power transmission can be quickly recovered, and meanwhile, direct current impact current after a fault is cleared is reduced; and secondly, the frequency of the passive network changes along with the direct-current voltage of the inverter side, the unbalanced power of the system is actively consumed by utilizing the self frequency regulation characteristic of the load, and fault ride-through is realized while load shedding is effectively avoided. According to the method, alternating-current fault ride-through of the sending end can be effectively achieved, meanwhile, the passive network dynamic load of the recei